HOA is restricting me from putting up a vinyl fence.

Submitted request 2 times with pictures. Turned down both times. Covenants say the the fences must be of wood and natural appearance. They have violated there own covenants because the rec area has a chain link fence and an open vinyl fence exist in the area. I have gotten a petition signed by more the 2/3 of the homeowners approving my vinyl fence. The president says that it doesn't count that it has to be come kind of proxy. I have read the covenants and restrictions and articeture guidelines and I stated that I didn't see where that didn't count and could he show me where it said it wasn't valid. He said this would have to be a policy change but the rules say that technological advancements may be taken into consideration. I have not heard from him. They have approved my neighbors deck across the street that is made of composite material. The covenants clearly state that it should be water resistant wood.